Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
Sign in using an external account
Register Forgot Password?


Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 02-19-2011, 08:33 AM
bad_behavior bad_behavior is offline
New User
 
Join Date: Feb 2011
Posts: 8
bad_behavior is starting off with a positive reputation.
390 Ignition timing

Have a question for you guys. I am going to check the ignition timing on my 390, but someone has removed the valve cover tag that shows where it should be set. While looking around the web I see that some people set it at 6 degrees, while others set it between 12-14. Thanks
Reply With Quote
  #2  
Old 02-19-2011, 09:59 AM
bertha66's Avatar
bertha66 bertha66 is offline
Post Fiend
 
Join Date: Oct 2004
Location: Central Oregon
Posts: 6,939
bertha66 is a splendid one to beholdbertha66 is a splendid one to beholdbertha66 is a splendid one to beholdbertha66 is a splendid one to beholdbertha66 is a splendid one to beholdbertha66 is a splendid one to beholdbertha66 is a splendid one to behold
I run my FE engines at 10 degrees, it seems to be a good starting place. Then you can ajust to the best running.
__________________
Allen D
1966 F-100 4x4 with 390 GT engine
1990 Areostar 2wd XLT ext
1980 Bronco with 460
1976 F250 4X4 Custom with 429
Oregon Chapter Member: To join the Oregon Chapter, click HERE
Reply With Quote
  #3  
Old 02-19-2011, 01:26 PM
yellow truck's Avatar
yellow truck yellow truck is offline
Senior User
 
Join Date: May 2007
Location: Calgary
Posts: 339
yellow truck is starting off with a positive reputation.
First, I have been told by several guys that the timing on these old Fords is not always correct, so you could be showing 10 degrees on the harmonic balancer but it is really several degrees either way.

We originally set mine the old way, pushed it until it rattled, and then backed off till it stopped. Following this approach we set it at 12 degrees. This is not that easy with a stick, so I had doubts.

A local shop just got a dyno and the owner was telling me that he used to think he knew how to time an engine, but that the dyno had humbled him. I decided to drop the $130 and we put it on the dyno (my results are in my gallery). 14 Degrees turned out to be the best run on my engine.

Now I run about 10 to 1 compression, mostly stock heads and intake, and a pretty boring cam. Since I live at 3500 feet, advance and knock are a concern. I doubt that I actually have 14 degrees of advance.

Next up I'm thinking about aluminum heads and a hotter cam. The idea is that aluminum heads will allow more advance before pre-ignition sets in. What I'm curious about is if the dyno indicates more advance with aluminum heads. The experiment may not reveal useful data as I'll be changing valve sizes and cam at the same time.
__________________
Paul.
1969 F100 4WD - 410 (not yellow anymore)
Reply With Quote
  #4  
Old 02-19-2011, 01:38 PM
Ziegelsteinfaust's Avatar
Ziegelsteinfaust Ziegelsteinfaust is offline
Posting Guru
 
Join Date: Dec 2010
Location: Chino Hills
Posts: 1,119
Ziegelsteinfaust is starting off with a positive reputation.
I have a 352 that is stock, and it like 15+ initial and 36 total. I started it up this morning after I fixed my distributer, and it fired up on the first shot.

I imagine my truck has a stock low compression rebuild with about 8.5 compression.

So you 390 should like the same unless you have added lots of copmpression or cam. I live in SoCal about 100ft above sea level.
__________________
Sitzungstiefpunkt und fahrend langsam

......................_____
.........________//__{\_____
,,,,,,,/__(O)___//___/__(O)_/
Reply With Quote
  #5  
Old 02-19-2011, 05:21 PM
Sleepy445FE's Avatar
Sleepy445FE Sleepy445FE is offline
Posting Guru
 
Join Date: Nov 2010
Location: Axtell, TX
Posts: 1,436
Sleepy445FE is gaining momentum as a positive member of FTE.Sleepy445FE is gaining momentum as a positive member of FTE.
the 390 came with either 9.5:1 or 10.5:1 CR so it won't be the same as an 8.5:1. I highly doubt he'll be able to run 15° or more bdtc. I'd say start at 10° and change as necessary from there depending on altitude, CR, and octane gas you are going to run.
__________________
Jeremy

1976 F250 4x4 Ranger XLT. 445FE, NP435/205, D44/60 4.10
AKA the never ending project.
Reply With Quote
  #6  
Old 02-20-2011, 10:11 AM
bad_behavior bad_behavior is offline
New User
 
Join Date: Feb 2011
Posts: 8
bad_behavior is starting off with a positive reputation.
Thanks for the information. She is at 10 degrees when I checked, so I just left it be. The only reason why I wanted to check the timing is because she is very hard starting after I drive around, so now im guessing that the coil might be bad? Starts fine in the morning, but after warm up I have to crank with the gas to the floor for about 5-10 secs before she starts.
Reply With Quote
  #7  
Old 02-20-2011, 10:24 AM
arctic y block's Avatar
arctic y block arctic y block is offline
Old School
 
Join Date: Sep 2006
Location: Island Southeast Alaska
Posts: 12,711
arctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputation
Is the starter motor maybe dragging when the engine is warmed up? Do ya have stock manifolds or headers? Both can heat up a starter and if it is going south it will drag when hot but crank fine when cold. My .02
__________________

85 XLT Bronco 351W HO 4V Dual Pipes 33X12.5 BFG's
62 Uni 390 C6 Custom Cab Sold for 9.5K
Don't just Modify it Fordify it
A Side Arm Is Like A Parachute, Tis Better To Have One An Never Need It, Than To Need One And Not Have It

Reply With Quote
  #8  
Old 02-20-2011, 10:30 AM
bad_behavior bad_behavior is offline
New User
 
Join Date: Feb 2011
Posts: 8
bad_behavior is starting off with a positive reputation.
Quote:
Originally Posted by arctic y block View Post
Is the starter motor maybe dragging when the engine is warmed up? Do ya have stock manifolds or headers? Both can heat up a starter and if it is going south it will drag when hot but crank fine when cold. My .02
The engine is completely stock with a new starter. She cranks over fine, but after I shut the engine off then go back to restart her, I have to crank with the pedal to the floor for 5-10secs. If I wait for a few hours then try, she will fire up with the turn of the key. I don't have any history on the motor as I just bought this truck with it running like this.
Reply With Quote
  #9  
Old 02-20-2011, 10:39 AM
arctic y block's Avatar
arctic y block arctic y block is offline
Old School
 
Join Date: Sep 2006
Location: Island Southeast Alaska
Posts: 12,711
arctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputation
My next guess and the thing that comes to mind is that it may be flooding. You are not pumping the throttle to start when hot but just holding it open, Right?

Take off the air filter housing and immediately after shutting the engine down look into the carb. Is there any fuel seeping in? Or a strong smell of gas? Is it wet inside?

What carb ya got and how old and what shape is it in?
__________________

85 XLT Bronco 351W HO 4V Dual Pipes 33X12.5 BFG's
62 Uni 390 C6 Custom Cab Sold for 9.5K
Don't just Modify it Fordify it
A Side Arm Is Like A Parachute, Tis Better To Have One An Never Need It, Than To Need One And Not Have It

Reply With Quote
  #10  
Old 02-20-2011, 10:43 AM
arctic y block's Avatar
arctic y block arctic y block is offline
Old School
 
Join Date: Sep 2006
Location: Island Southeast Alaska
Posts: 12,711
arctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputation
Let's not rule out weak spark at this point either. What ignition system do you have? Is the engine stock or modified? And what is it in?
__________________

85 XLT Bronco 351W HO 4V Dual Pipes 33X12.5 BFG's
62 Uni 390 C6 Custom Cab Sold for 9.5K
Don't just Modify it Fordify it
A Side Arm Is Like A Parachute, Tis Better To Have One An Never Need It, Than To Need One And Not Have It

Reply With Quote
  #11  
Old 02-20-2011, 11:17 AM
bad_behavior bad_behavior is offline
New User
 
Join Date: Feb 2011
Posts: 8
bad_behavior is starting off with a positive reputation.
Quote:
Originally Posted by arctic y block View Post
My next guess and the thing that comes to mind is that it may be flooding. You are not pumping the throttle to start when hot but just holding it open, Right?

Take off the air filter housing and immediately after shutting the engine down look into the carb. Is there any fuel seeping in? Or a strong smell of gas? Is it wet inside?

What carb ya got and how old and what shape is it in?

I rebuilt the carb (Motorcraft D5TE-ASA) a few days ago thinking that was the problem, but nothing has changed other than I can mash the throttle without her stalling. There isnt a strong gas smell after I shut her down, and I will check to see if there is gas seeping in after shut down. Oh, I forgot to mention that there is some minor popping from the exhaust while idling. Its not a constant popping, but more like a faint pop every 2-5 secs. Maybe it still is a carb issue.
Reply With Quote
  #12  
Old 02-20-2011, 11:18 AM
bad_behavior bad_behavior is offline
New User
 
Join Date: Feb 2011
Posts: 8
bad_behavior is starting off with a positive reputation.
Quote:
Originally Posted by arctic y block View Post
Let's not rule out weak spark at this point either. What ignition system do you have? Is the engine stock or modified? And what is it in?

Where would I look to see what ignition system I have?
Reply With Quote
  #13  
Old 02-20-2011, 11:22 AM
arctic y block's Avatar
arctic y block arctic y block is offline
Old School
 
Join Date: Sep 2006
Location: Island Southeast Alaska
Posts: 12,711
arctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputation
Quote:
Originally Posted by bad_behavior View Post
Where would I look to see what ignition system I have?
What year truck are we dealing with? Is it electronic or point type ignition?
__________________

85 XLT Bronco 351W HO 4V Dual Pipes 33X12.5 BFG's
62 Uni 390 C6 Custom Cab Sold for 9.5K
Don't just Modify it Fordify it
A Side Arm Is Like A Parachute, Tis Better To Have One An Never Need It, Than To Need One And Not Have It

Reply With Quote
  #14  
Old 02-20-2011, 12:10 PM
bad_behavior bad_behavior is offline
New User
 
Join Date: Feb 2011
Posts: 8
bad_behavior is starting off with a positive reputation.
Quote:
Originally Posted by arctic y block View Post
What year truck are we dealing with? Is it electronic or point type ignition?
76', and it is electronic ignition.
Reply With Quote
  #15  
Old 02-20-2011, 12:31 PM
arctic y block's Avatar
arctic y block arctic y block is offline
Old School
 
Join Date: Sep 2006
Location: Island Southeast Alaska
Posts: 12,711
arctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputationarctic y block has a superb reputation
That's a Duraspark II. A pretty dependable system. They generally work or they don't. Ya could try a new coil. And take the Module to like Autozone and have it tested. There are guy's here that can tell ya how to test the coil with a multi-meter.

How is the spark at the plugs when it is hard to start? Maybe check the spark when cold than hot and compare it. Spark should be blue and snap and jump a long way.
__________________

85 XLT Bronco 351W HO 4V Dual Pipes 33X12.5 BFG's
62 Uni 390 C6 Custom Cab Sold for 9.5K
Don't just Modify it Fordify it
A Side Arm Is Like A Parachute, Tis Better To Have One An Never Need It, Than To Need One And Not Have It

Reply With Quote
Old 02-20-2011, 12:31 PM
Reply

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)

Tags
1976, 390, 76, advance, degrees, distriutor, engine, f100, fe, ford, ignition, timing, timining, turn, v8

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump



All times are GMT -5. The time now is 07:20 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup